CVE-2026-115374 Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 Unsigned Header Bypass in Presigned S3 Upload URLs
High 7.1
Published
Updated
Check this codebase for CVE-2026-115374 and fix it if it is affected.
What it is: CVE-2026-115374 is a high-severity vulnerability in lxc incus, published on 22 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-115374 in the wild and no public exploit code.
Affected product: lxc incus. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-115374/ (Markdown: https://insights.sbomify.com/CVE-2026-115374/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115374?
CVE-2026-115374 is a high-severity vulnerability in lxc incus, published on 22 Oct 2026.
Official description
Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 contains a signature verification flaw in its built-in S3 server that allows presigned URL holders to inject unsigned x-amz-* headers. Attackers can add an unsigned X-Amz-Copy-Source header to a presigned upload URL to copy other bucket objects onto the granted key, disclosing their contents and ETags.
Weakness: CWE-347
Which versions are affected by CVE-2026-115374?
How do I fix CVE-2026-115374?
Upgrade to a fixed version.
Is CVE-2026-115374 being exploited?
There is no known exploitation of CVE-2026-115374 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-115374, GHSA-m6pj-594x-rw4f, GHSA-mmj7-8rgf-mx2h, UBUNTU-CVE-2026-115374.